Radioreceiver



Jan. 6; 1925. I 1,522,305

M. LATOUR RADIO RECEIVER Filed July 14, 1920 WIEEBEE'E' @Ygglfif $W$ if v WWW Patented, 6, 1925;

UNITED :sTA s-s PK-TENToFFICE. I Lam na-or rams,

Application filed July 14, 1920; Serial No. 396,281.

(GRANTED UNDER. THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT- I 1818.)

To u/Z whomit may concern:

Be it known that I; MAiuus LA'roun, citizen of the Republic of France, residing at Paris, in the Republic of France, have invented certain new and useful Improvements in Radioreceivers, (for which I have filed applications as follows: French Patent 1 No, 503,047, filed October 21, 1916; Great Britain application No. 20,809, filed-1. July 10, 1920), of which the following is a specification. i 1

This invention relates to a receiving arrangement for the reception of electromagnetic waves. a I According to the present invention such waves from a remote signalling source com trol the condition of a thermionic filament.

The-invention is more particularly described with reference to the accompanying diagrammaticdrawings- Figure 1 representsthe arrangement of the system when a batteryis used as a; local source for the lamp;

Fig. 2 is a diagram of the lamp circuit when a generator is used for this purpose. The receiving aerial 1 acts on a. circuit 2 comprising an inductance and gacapacity which feeds a high frequency amplifier.

' This amplifier is formed by severalther i IlllOIllC elements with three electrodes, grid 7 G. anode P, and filament F,mounted in usua1 -manner., The filaments of these thermionic elements are heated by a source of electrical energy 3 whilst their anodes are raised to the necessary potential by a source of electrical energy 4.

may bereceived which are sent out by a I graphic radiations. Under these con itions the waves received will only haveto furnish supplementary energy to cause the filament allows jot waves being received without usi The filament anode circuit I of the last, amplifying tube acts through a transformer A 6 on a small lam 7, having-asfine a metallic filament as possible (-for instance of tungsten)'.. Each wave received by the aerial and amplifier directly raisesthc filament to incandescence. W

By'the aid of the luminous incandescence 4 of the-filament an impression may be taken on a photographic band which is automatically unwound before a window illuminated by the said filament. i

In view of the dimensions of the filament,

59 calorific inertia is extremely small and consequently extremely rapid wave emissions band.

By this arrangement continuous waves may be received without'a-ny special heterodyne device. ;Nevertheless a small local generator of continuous waves of. the same frequency as that of the sending station may be substituted for the source of directcurrent 8, in such a way that the energy of the waves emitted by the local generator.

is 'added to that of the waves received.

Although the arrangement just described ing'a detector; it is also evident that the .just under that at which it emits ,hoto- I to make an impression on theqphotographie j amplifier might be placed subsequently to a. detector of any kind and thus make the,

am lification of low frequency,

other modification consists 1n reotify- 7 [ing the current before its admisslonto the thermionic tube. This rectifying may be done with theaid of valves or detectors placed subsequent to the amplifying system.

An advantage may be obtained from such detection with regard to sensitiveness if the source of current 8 be retained.

The shunt resistance 9 will be preferably placed across the terminals of the lamp to protect the latter against too violent straycurrents b acting as a voltage limiter.

assuming that an incandescent lamp is em ployed the arrangement extends to the case;

, where any other luminous source is employed, the brilliancy of whichfmay be regulated by an electrical potential or current.

If the system .be' applied toa receiver for wireless telephony, a photographic strip I similar to a recording photogra hie 'cylinder is obtained. By causin t is photo graphic strip to pass like a cmematograph before a selenium cell inserted in a circuit comprising a battery and a telephone, the said telephone'is able to reproduce the conversation received.--

. I declarethat what I claim is and the like comprising athermionic tube fani lifier," -an incandescent"lam connected and the like, comprising a. thermionic tube amplifier, an incandescent lamp ,connected with the said amplifier to be fed thereby, and a local generator producing-waves in ;synchronism.-with the. incoming high fre quency signals, said generator raising said lamp to mciplent incandescence I 3. A recelyer' for high frequency signals J and the like,' comprising in combination a thermionic -.tube amplifier, an electric lam ccrmected-v tolf tlie said amplifier and fe the said amplifier :to be ed thereby,

signed my name.

thereby? and an additional feeding source connected to the said lamp, said additional feeding source being formed by a local gen- I I v -erator of continuous oscillations. 1. a-i'receiver for high frequencylsignals 1 iw'lhe method of renderin imperceptible high frequency signals and t 1e like perceptible,- which comprises converting such signals into electric currents, and passing such currents through a resistance independ ently maintained near a temperature of incandescence. j

5. The method of converting imperceptible high frequency signals and the like into perceptible manifestations which comprises converting said signals into electric currents, combining said currents with currents from an independent source, and passing such combined currents through a resistance adapted to be brought to a state of incandescence thereby.

In witness whereof, I

M RIUS- LATOUR have hereunl c 

